Worktable for shoe sole stitching machines



Dec. 3, 1946. s, F, GRAFF 23111355 WORK TABLE FOR SHOE SOLE S TITCHINGMACHINES Filed Aug. 28, 1943 2 Sheets-Sheet 1 fifzwiipz De.3,194s. s. F.GRAFF'. 2,411,855

WORK TABLE FOR SHOE SOLE STITCHING MACHINES Filed Aug; 28, 1945 2Sheets-Sheet 2 3 V L l I: ;4 l 27 n" 1' r j} Z6 22 '23 /9 29 2 l vJFJUQDZO] Jianley ff] Graff EyJJZ'JAZZoJ QeyJ wwww/m Patented Dec. 3,F946 WORKTABLE FOR SHOE SOLE .STITCHING MACHINES JStanley' F. Graft,Minneapolis,

, Application August 28, 1943, Serial No'. 500,331

V r 1' My present invention relates to improvements in shoe stitchingmachines of the curved needle variety, and more particularly theinvention provides an improved work table for such curved needlemachines.

Particularly "the improvement is directed to the provision of the worktable with a'detachably and replaceable needle plate, and with a soleguid-' ing block or device. which, without detachment or removal, may begiven the finest and most minute kind of adjustments to vary thedistance of the line of stitches from the edge of the sole.

1 4 Claims. (01. 112-62) .In the accompanying drawings the improvedfeatures are shown as applied to the fixed arm ofa shoe stitchingmachine such as is well known to the trade as the Landis machine. 7Referring to the drawings wherein like characters indicate like partsthroughout the several views:

Fig. l is a perspective showing some of the parts of the standard Landiscurved needle machine and showing in detail the improved work table andattachments;

Fig. 2 is a section taken on the line 2-2 of Fig. 1;

Fig. 3 is a perspective showing the sole guiding blocker element turnedupside down;

Fig. 4 is a perspective showing a clamping block that forms an elementof the means for securing the sole guide block to the work table;

Fig. 5 is a section taken on the line 5-5 of Fig. 4;

Fig. 6 is a perspective showing the work table with the detachablefacing or needle plate removed therefrom;

Fig. '7 is a perspective showing the needle plate removed from the worktable and the co-operating clamping screws removed from the needleplate;

Fig. 8 is an enlarged section taken on the line 8-8 of Fig. 1; and

Fig. 9 is a bottom plan view showing a portion of the sole of a shoe andindicating the line of stitches that secure the same to the shoe welt.

As above indicated the invention as illustrated is applied to thestitching machine of the Landis type. Of the well known parts of themachine, insofar as they are shown in the drawings, the numeral It!indicates the fixed head, the numeral H the oscillatory needle guide,the numeral H the needle, the numeral [3 the awl and the numeral M thechannel cutter that carries the presser foot IS. The needle and the awlare of the curved type carried by customary oscillatory devices, notshown, but which move the said awl 2 a and needle through the same areand through the opening in the work table. In the standard machine thework table is formed on the extended end of a table supporting arm 16which, in the drawings, is shown as rigidly securedto the fixed head Inby means of a machine screw l1 and dowel pin'l8 but which, of course,can be supported in any suitable way. In the application of myinvention, the fixed arm Iii, at its extended end, carries the table. Asa feature of invention the table is provided with'a detachable needleplate or face plate. The table proper is preferably formed integral withthe arm 15 andis a bifurcated or 'U -shaped structure, indicated at l9,and shown in detail in Fig. 6." This table l9 has the customarydepending lip 29 that is engageable with the side of the shoe upper. Thedetachable needle plate, as best shown in Fig.- 7, is a bifurcatedstructure 2! formed with an outer portion having a slot or needlepassage 22.- The needle passage 22 is formed in avertica'llythickenedportion of the needle plate that is seated in a depressed portion 23 ofthe table. The needle plate 2| is rigidly but detachably secured to thetable by machine screws 24 or the like passed through perforations inthe prongs of said needle plate and screwed into threaded seats 25 inthe prongs of the table. The passage between the prongs of the table [9is considerably wider'than the passage between the prongs of the needleplate 2|.

Fitted to slide in the space between the prongs of the table [9 and tobear against the overlying portions of the prongs of the needle plate 2|i a rectangular clamping block 26.

Seated to slide on the prongs of the needle plate 2| is a guide block 21that is preferably of elongated rectangular form and is threaded to areceive the threaded shank of a large clamping screw 28, seeparticularly Fig. 2. This clamping screw 28 at its lower end has a roundhead 29 that is seated to rotate in the annular recess of the clampingblock 26. The threaded stern of the screw 28 works 'freely and withclearance through a large central passage 26" of the clamping block 26.

Obviously with the structure described, when the clamping screw 23 isloosened the guide block 21 can be adjusted to just the desireddistances from the needle passage and from the line of movement of theneedle; and when the said screw is tightened, the said block will besecurely anchored to the needle plate or top element of the table. Ofcourse. the clamping block 26 is freely movable with the guide block 21and in the channel like seat formed therefor in the prongs of the table19.

As an efiicient and desirable way of tightening and loosening thclamping screw 28 the latter is shown as formed with an angular passageto receive the angular end of the wrench 30 shown in Fig. 8.

In Fig. 9 the shoe sole A is indicated as provided with two rows ofstitches alocated at different distances from the edge of the sole.Obviously, the guide block 21 can be accurately set to guide the shoefor the forming of stitches just the desired distances from the edge ofthe shoe sole. The shoe sole will, of course, bear against the frontface of the guide block when the shoe is applied as shown in Fig. 8. Inthe said view, Fig, 8, the shoe sole is indicated by the character B,the shoe welt by the character C and the shoe upper by the character D.

In setting the guide block 2'! it is only necessary to loosen the screw28 enough to permit the sliding movement of the block and this, ofcourse, can be done and the block relocked in a most accurate adjustmentWithout at any time removing the guide block from the table.

In practice it has been found that it will often happen that the needleor the awl or both will be slightly bent and will engage the rim of theslot or passage in the table and deface the same so that replacement ofthe entire table has been necessary. With the face or needle plate madedetachable, it is only necessary to replace the latter Without theremoval or renewing of the table. The shoulders formed between theoffsets of the table and face plate serve to more accurately adjustthese two elements before the screws 24 have been applied and tightened.

In actual practice the invention above described has been foundthoroughly practical and desirable for the purposes had in view. Ofcourse, the devices will be modified as to details of construction andarrangement of parts within the scope of the invention herein disclosedand claimed.

Whereas the invention is herein illustrated in connection with a Landiscurved needle machine, it should be understood that the invention isequally adapted for use in connection with any curved needle shoestitching machine.

What I claim is:

l. A work table for shoe sole'stitching machines formed with a needlepassage, said table having a shouldered longitudinal slot, a guide blockseated on said table and having a portion working in the slot of saidtable, a clamping block working in said slot and having a clampingaction on the shoulders thereof, and a clamping screw having a headrotatably mounted in said clamping block for sliding movement therewithand having threaded engagement with said guide block.

2. A Work table for shoe sole stitching machines having a detachableface plate formed with a needle passage, said face plate having a slotat one side of said needle passage, said table having a wider slotunder-lying the slot of said face plate, a guide block mounted on saidface plate and provided with a portion extended into the slot of saidface plate, a clamping block slidably mounted in the slot of said tableand engaging the over-lying portion of said face plate,-and a clampingscrew having a head rotatably seated in said clamping block and havingthreaded engagement with said guide block.

3. The structure defined in claim 2 in which said detachable face plateand the body of said work table have over-lapping arm portions, andmeans detachably connecting the arm portions.

4. The structure defined in claim 2 in which said face plate and thebody of said work table are formed with over-lapping U-shaped portions,the portion of said face plate in which the needle passage is formedbeing of increased thickness and fitting a depression formed by areduced under-lying portion of said table.

STANLEY F. GRAFF.

